Automatic fire-shutter mechanism



W. E. DUNCANSON AUTOMATIC FIRE SHUTTER MECHAXISM Feb. 15, 1927., 1,617,440

Filed Dec. 23, 1925 4 Sheets-Sheet 1- v i I Zrl INVENTOR VVAL TEA f Owen/v50 Feb. 15,1927. 1,617,440

4 w. E. DUNCANSON AUTOMATIC FIRE SHUTTER MECHANIW Filed Dec. 23, 1925 4 Sheets- Sheet z J Mm l A M m m 4 Y m m a w A. w 1 .J m W W mm \n 6 K M V /4 r/////w//// r//////// w///////// w x M M 8 u V M :W

9 v 1 617 440 Feb 27 w. E. DUNCANSON Au'romnc FIRE SHUTTER MECHANISM Filed necfzis, 1925 4"Sheets-Sheet 4 INVENTOR WALTER ffiUA/C/M/SO/V 4 ATTOR EYS W'ALTER E. DUNCANSON,OF NEW YORK, N. r; Assrenon TO THE 5. e. wrnsoiv conrorte'rron, on NEW YORK, N. an, A CORPORATIQN 0F VIRGINIA.

AUTOMATIC FIRE-SHUTTER MECHANISM.

Application filed December 23, .1925. Serial No. 77,250.

This invention relates to automatic fire shutters, and more particularly to fire shutters of the type in which the shutter is constructed and arranged to be coiled on and uncoiledfrom a rotary roller in opening and closing the same.

In fire shutters of the automatic type, the shutter is held in fully open or partially open position by a mechanism comprising an element which is fusible upon the occurrence of a dangerous rise in temperature. Upon'the fusing of this element, the shutter is released by said holding mechanism and allowed to close.

Automatic fire shutters are frequently tested by the fire underwriters to determlne whether they are in operating condition. In'

testing a shutter either the fusible element is fused or the shutter-holding mechanism is otherwise operated upon to release the shutter. Fire shutters are also often closed and locked at night so as to prevent theentrance of thieves or other unauthorized persons into the building and'also to prevent or retard the passage of fire through the wall opening. V I

In the usual construction, after each of said closing operations, the shutter is re stored to its fully'open or partially open position by grasping the handles with which the shutter is ordinarily provided, and raising the shutter. The shutter may be raised to a partially open position while the operator stands on the floor of the building.- In raising the shutter to its fully open position, the raising operation is completed by the operator whilestanding on any suitable elevated support such as the sill of a window atwhich the shutter may be installed. This manner of'raising the'shutter manually obviously requires considerable labor and is highly inconvenient and the operation may be dangerous; as when the shutter is mounted on the outside of a high window opening. One object of the present invention is to provide fire shutters of the automatic type with novel and improved lifting mechanism by which the shutter may be quickly and easily raised manually to its open position.

The holding mechanism of shutters of this type ordinarily comprises two or more chain sections between which are interposed fusi ble links connectlng said sections, the shut' ter being released by the fusing of one of these links. The fusing of a link leaves two constructions therein free or unconnected chain ends, and in resetting the shutter mechanlsnnna new, link is inserted to connect up these chain ends. .The r Another object of the present invention is toimprove the constructionandmode of op:

eration of the mechanism for holdingan automatic fire shutter in'open position and ;to provide a shutter holding-mechanism which may be quickly and easily reset from within? the building after each fusing of the fusible element.

With this and other objects in view, the invention comprises the novel and improved features, constructions and combinations of parts hereinafter described and particularly pointed out in the claims. the advantages of which will be readily understoodand appre ciated by those skilled in the art.

The invention will be clearly understood from the accompanying drawingsillustrating the invention'in its preferred form and the following detailed description of the shown In the drawings: Fig. 1 is a view in front elevation of an automatic fire shutter mechanism embodying the invention; r v Fig. 2 is a sectional. view taken substantially on the line 2-2 of Fig. 1;

Fig. 3 is a sectional View taken substantially on the line 33 of Fig.1;

Fig. 4 is a view in vertical section taken;

substantially in the plane through the axis of the shutter; I p Fig. 5 is a view similar to Fig. 2 illustrating a modified construction; i Fig. 6 is a view similar to Fig. :3 of the modified construction shown in Fig. 5; i' Fig. 7'is a detail view in front elevation,

illustrating certain parts of the devicefor holding the shutter in open position; I

Fig. 8 is a detail view inside elevation illustrating certain parts ofthe shutterholding devices;

Fig. 9 is a detail sectional, view of the brake disc forming part of the shutter-hold.

ing mechanism; V y

Fig. 10 1s a detail view illustrating a portion of the brakeband and an associated part, forming part of the shutter-holding mechanism;

Fig. 11 is a detail view illustratmg a brakeband actuating lever forming part of the shutter-holding mechanism shown in 7 Fig. 6;

Fig. 12 is a detail sectional view illustrating certain parts of theshutter-lifting mechanism;

Fig. 13 is a detail view in side elevation showing certain parts ofthe mechanism illustrated in Fig. 12;

Fig. 14; is a detail view in side elevation, illustrating the mechanism for retarding the downward movement of the shutter; and

Fig. 15 is a detail View in side elevation illustrating certain parts of the mechamsm shown in Fig. 14. 7

Referring to Figs. 1 to .t inclusive, 7 to inclusive and 12 to inclusive of the drawings, the coiling shutter embodied in the construction therein shown may be of any shown in Fig. 5.

-The shutter is mounted upon a rotary suitable type such as that made up of jointed netal slats, and is indicated at 2 in the drawing, the shutter being diagrammatically shown. 7

The shutter is mounted or installed adjacent an opening 4 in a wall 6 of a building to close this opening in case of fire. The shut ter is arranged to be coiled up on and be uncoiled from a rotary roller and the lateral margins of the shutter engage in channel shaped guides 8, arranged on opposite sides of the door opening. An anglebar 10 is attached to the lower margin of the shutter, as

ro1ler12 to which one end of the shutter is attached. To one end of the roller 12 is'secured a short shaft 14:, engaging in a bearing in the shutter frame. The other end of the shutter is mounted to rotate upon a 45 shaft 16 fixed in the shutter frame, this shaft passing through a block 18 secured within one end of the roller 12.

The shutter is preferably partially counter-balanced so that a relatively light force is required to hold the same in open position or to close the same against the action of the shutter-holding means. The counterbalancing mechanism comprises a coiled spring 20 arrangedwithin the roller 12, one

end of which spring is attached to the roller and the other end of which is attached to the shaft 16, as shown in Fig. 4:. With this arrangement of the eonnterbalancing spring 20, the spring is constantly operative and I acts on the shutter in all positions thereof.

The shaft 16 is rotatably adjustable in its bearing in the shutter frame to adjust the tension of the spring 20 and is held in adjusted position by means of a disc 22 secured to the outer end of the shaft and a pin 24; engagingin anopening in a fixed bracket 26' and in one of a series of openings 27 in said disc.

The spring 20 is preferably formed with its coils out of contact and is attached at its ends respectively to the roller 12 and the shaft 16 so that when installed, the spring is free from longitudinal tension. Thus there is no friction between the coils of the spring during the rotation of the roller and no end thrust produced by the spring upon the roller to cause the roller or its connected parts to bind frictionally against the parts of the shutter frame. This enables a smooth,

positive closing action to be effected.

As shown clearly in Figs. 2 and 3, the shutter roller and associated parts are mounted in an opening in thevwall 6 and enclosing plates 29 and 31 form, together with the said 7.

wall, a housing within which the shutter is normally enclosed.

The mechanism forvholding the shutter normally in open position, comprises, in the illustrated form of the invention, a brake wheel or drum 28 rotatably mounted upon a stud 30 secured in a'suitablebent support ing plate 32 attached to thev shutter frame. The brake wheel 28 is connected for rotation with the shutter roller during the uncoiling movement of the shutter by means of a pawl 34 pivoted on a stud 36 secured in the wheel 28, this 'pawl being arranged to engage the teeth on the periphery of a toothed disc 38 secured to the outer end of the shaft 14. The pawl is yieldingly held in engagement with the teeth of the disc by means of a leaf spring 40, one end of which is secured to the pawl and. the other end of which engages a pin 12 secured to the wheel. This connection between the shaft 1% and the bralrewheel enables the roller 12 to rotate independently of the brake-wheel during band 44: passing about the same, one end of which is secured to a bracket 16 attached to the shutter frame. The brakeband is preferably formed from spring metal and is placed under tension in bending the same about the brake-drum so that the band tends to spring outwardly away from the periph cry of the drum. The other end'of the brakeband is connected with an actuating and controlling lever 18 pivoted at 50 onth-e shutter frame, one end of which is formed with a hook engaging in a slot 52 in the bralreband. The lever 48 is acted upon by a leaf spring 54 which tends to swing the same to theainnerside of the wall and'sextendsover germ-44.0.1

sure to. maintainithe shutter? in raised positron by;mechanism comprising one. or: more elements which are. fusible upon the occur rence of a dangerous rise-in temperature; the

fusin zofone ofrth ese elements releasin said lever.. As shown in 8, the lever 48' projects through an-opening in the enclosingplate 31 to the -l11Sl Elge"Of tl1ewall 6* and the said-mechanism for holdin the lever in 1 n I b position as; connected with the lever' 'upon the inner. side of the wall, This mechanism come prisesa chain section 56 attached at one end to the lever: 48? and extending downwardly therefrom: about a. pulley 58 mounted onia bracket 60. attached to :the inner side" of the wall 6. L The chain thence extendsoutwardly through a pipe 62 mounted in the; wall and over aprrlley 64 mounted onfla bracket 66' attachedtotheouter side-of the wall. The chain then passes back throughxthe P1138462 a third zpnlleyvGS- mounted ;on a bracket 70. To the other: end of? the chain section 56 is connectedone endof a coiled spring 72,.to the; other end of which :isconnecteda chain section "7 iicarrying awha-ndle 75.

links. of the. chain section are. com. necte'dby 'a 1 fusible. link 76' located upon: the innersideof the-wall; 6', the links.- of. the chainahavingghooks 78- which are inserted in openings in the. ends -of:the fusible links. The length of that 2 part of? the chain section 56 connected by the fusiblelink iscensi-deu' ably greater than the; lengthzof' the fusible linleso thtttli said 'partofthle: chain section hangs in a slack loop. Two linksof the chain SGCtlOE' areconnected .inialsiinilar 1113111161 byi azfusible link 80 leavin'g a. slackloop: of said chainsection hangingqbetween the ends 1 of said link The link-80' is located upon the ouztersside ofthe wall 6''.

In setting theholdin'g; mechamismifor the" 5 8is thus set, the pull exerted onthe: inner: end of the lever by the chain section 56 willmaintain the brakcband in brakingengag mentpwith the brake-drum QS'and thls pres sureof the brakeband on the lorakedrumv may beadjustedso that'the shutter will'b'e held in raised position by a'suitable adjustment of the chain section 7% relative to: t-J'Q: bracket: 82. Upon the occurrence ofiafdanzeroes-rise in temperature; on eithenside of.

" tllB'iWZl'llB", oneeof thefusiblelinks-TG and 80 wheel.

on the brake: wheel.

will fusev and the. slack portion .ofl the chaini betweenthe: ends 1 of "said link will relieve/thetension on-the lever 48' and allow the. brake band s ltomelease the-brake-drum 28;v The:- shutter: will then; descend and r closethe wall. opening. Chain section 5.6 may be=connected with. the. lever. 48* at. different/1 points longitudin ally .of:the lever to adjust the pullionsaid lever,cthe lever.-having azseries ofopen-v in-gs 88 through which the chain: may he passed.

In 'testingan automatic shutterof this type-,- V a representativeof the underwriters; often applies a torch to. one ofthe'fusible links to cause the release ofthe shutter. In reset:- tingth'e shutter-holding mechanism afterthe fusing ofione of these links,-.a corresponding newlinkisattached in proper position-with relation to the chain section'56i Inwthe present: construction; when either of the fusible links 76' and'SO is fused, a new linkunaybe inserted quickly and'easilyby an operator from the-inside. ofthe. building... Tlris ob vi'atesthe necessity for-"the operator to-plaee himselfiinahigh or dangerous-position iiiresetting this -mech'anisms :as' is often :the. case with: constructions heretoforeproduced.

In inserting a new. fusiblelinkiforithe one whichv has been fused in the present COI'1'- I struction, there are no loose chain ends to be picked up and'attaehed togetherz Inthis operation; the chain section 74 'is-disengagedfrom: thebracket 82 and the two-linksto which the hooks-78am attaeh'ed are drawnsuiliciently close together to allow a new fusible linkto be inserted inpesition. A'inew link'8O may be readilyinserted frona within the building. Bya grasping the. chain section 56. between the fusihle link 76 and pulley= 58,-

or: below the vpulley:58 and Epullin'gthe same 'may be drawn through'th-e pipe to the inside of the wall 6..- Thenew link 80 maythenz be readilyeittach ed in place, after which 1 1 the link may. bedrawn b aclr to -its normal i position: on the outside ofi'thewall 6 by pull ing on the chain section =74.

It is? ofteni desirableth'at' an operator:

shouldbe1-able to raise and lower the tire shutter-rwithout disturbing the emergency devices for" holding the shutternormally in raisedposition: In the present construe-- tion,:.the connection betweenthe shaft= '14:

and'the brake. wheel='28' allows the shutter to be raised without rotating the brake The brake mechanism,- therefore does. notretard the raising movement of the shutter. In lowering theshutte-Pmanually the: operator grasps the lower edgeofitheshutter and pulls the 1 same down againstthe friction exerted b'y. the'b'rake band 44:

In order that this friction may be more readilyovercome, the

contacting surfaces of the brake wheel I and j I ter when open.

brake band are rendered somewhat slippery by the application of grease thereto. As shown clearly in Figure 9, the. brake wheel is provided with a series of pockets 82' which are filled with grease to applyv the same to the surfaces.

lVith the above construction the brake band always exerts a yielding pressure upon the brake wheel and this pressure may be adjusted so that it is just sufficient to overcome the over-balancing weight of the shut- In closing the shutter manually it is necessary to exert aforce just sufficient to overcome the frictional action of the brake. Thus, the 1 shutter may be readily closed and may thereafter be raised to its normal position without disturbing V the emergency mechanism for holding the force acting upon the shutter during the first part of its closing movement, a weight bar 84 is mounted with its ends engaging in guides in channel bars 86 mounted at the sides of the door opening, these channel bars being located within the guides for the shutter. The angle bar 10 at the lower end of the shutter projects across the path of movementof the weight bar 84 so that the'weight bar is engaged and lifted by the shutter during the upward or opening movement of the shutter. The weight bar also slides upon guide rods 88 passing loosely through plates 90 secured" within the upper ends of the channel bars 86, the downward movement of the guide rods being limited by suitable stops. loosely in openings in the ends of the weight bar and the downward movement of the weight bar is limited by means of nuts 92 threaded upon the lower ends of the guide rods; By a suitable adjustment of these nuts the extent of the downward movement of the weight bar may be readily adjusted.

The mechanism for raising the shutter manually is arranged to be operated to impart an intermittent rotary movement to the roller 12 and'thereby to raisethe shutter end a gripping block 96 pivoted upon a stud 98 secured in the arm and arrangedto engage the periphery of a disk 100 secured to the block 18 to rotate with the block andshutter roller. The arm 94 is held from movement away from the disk 100 by means of a plate 102 secured to the stud 98 and The guide rods 88 engage with the plate 102 in engagement with a stop pin 104 secured to the shutter'frame.

With the arm in this position. the gripping block 96 is normally held out of engagement with the periphery of the disk by the weight of the outer portion of said block, so that the disk can rotate freely. In raising the shutter the gripping block is first swung in a direction to engage the same with the periphery of the disk 100 and said block and arm 94 are then swung upwardly, the

movement of the arm being limited by a stop pin 106 arranged to engage the plate 102. This movement of the gripping block and arm 94 rotates the disk 100 in a direc-' tion to raise the shutter, the shutter roller rotating independently of the brake wheel during this movement. is then released from gripping engagement with the periphery of the disk 100 and gripping block and arm .94 are allowed to drop back to their initial positions. These movements of the gripping block and arm are repeated until the shutter is raised to its fully open position. i

The gripping block and arm are actuated in the manner described by means of a chain 108 attached at one end to the outer portion of said. gripping block and extending upwardly therefrom over a pulley 110 mounted on a bracket 112. Thence, the chain extends inwardly through an opening in the plate 31,

and over a pulley 114 mounted on a bracket 116 and then downwardly upon the inside of the wall 6, the chain having a handle 1.18 attached to its lower end. With the arm 94 and gripping block 96 in the position shown in Figure 2, by grasping the handle 118 and pulling downwardly on the same, the gripping block will be caused to grip the periphery of the disc 100, and the grippingblock and arm will then be swung upwardly to rotate said disc through a part of a revolution. 7 Upon releasing the handle 118, the arm or gripping block will drop back to their original position. By repeating this operation'a number of times the shutter may be readily raised from closed position to its normal open position.

The shutter also is preferably provided The gripping block with a mechanism for retarding the downward movement of the shutter. In the present form of the invention, the retarding mechanism is similar to that disclosed inapplicants pending application, Serial No. 7,513, filed February 7, 1925. This retarding mechanism comprises a swinging arm 120 pivoted at 122 on the shutter frame and carrying at its lower end an adjustable weight 124 and a pair of pawls 126 and 128 secured rigidly to said arm and arranged to engage a toothed wheel loosely mounted upon the shaft14. This toothed wheel .is connected for rotation with'the shaft 14 during the downward movement of the shutter by mine-4o means of'a spring pressed pawl 132 pivoted upon an arm 134 secured to said shaft and arranged to" engage the toothed wheel 130 (see Figs. 4, 14 and 15).

As the shaft 14L is rotated during the downward movement of the shutter, the toothed wheel 130 is rotated therewith through the engagement of the pawl 132, with said wheel and. the swinging arm 1 is swung in opposite directions by the action of said wheel upon the pawls 128 and 126, thereby retarding the downward movement of the shutter.

When. the shutter is raised, the pawl. 132

passes idly over the teeth: of the toothed wheel 130 so that the retarding mechanism. has, no retarding effect upon the movement ofthe shutter.

In the construction shown in Figs. 1, 2, 3

' and 4, the roller upon which the shutter is coiled. the mechanism for supporting the roller, the mechanism for holding the shutter in open position and the retarding mechanism. for the shutter are all'arranged within the housing formed by the opening in the wall 6 and the enclosing plates 29 and 31. In

' the construction shown in Figures 5 and 6' arrangement from the corresponding parts shown in Figures 1 to 4 inclusive, but have the same mode of operation.

As shown in Figs. 5, 6 and 11, the chain section 56 is attached at its upper end to a bracket 138 projecting from. the inside of the Wall: 6.. Thence the chain section passes-over pulley 58,.through pipe 62 and then about a pulley 140 mounted on the brakeband controlling lever 48. From this pulley the chain section extends back through the pipe 62 to the inside of the wall,over pulley 68 and is connected with spring 72.

The shutter lifting mechanism shown in Fig. 5 has substantially the same general construction and mode of operation as the lifting mechanism. shown in Figs. 1 to 4L inclusive. 1,

In the construction shown. in Fig. 5, however, the chain 108 passes from the gripping block 96 upwardly over a pulley 110. mounted on a bracket 112, then through a pipe. 142 mounted in the wall 6 to the inner sideof the Wall, then over a pulley 114 mounted on a bracket 116 andv downwardly along the in ner side of the wall.

The shutter raising mechanism above described may lee-employed in connection with either'shutters of the normally open type, or with shutters of the counterbalanced type; It, therefore, is adapted for use in combination with'shutters for fire, wa1l, cor ridorf, elevator and exterior. wall. openings. It is to be understood, therefore, that the shutter raising mechanism; is not limited. in its application to any particular class of'coiling shutters.

Whatis claimed as. new -is' 1. An automatic fire shutter mechanism comprising in combination a roller,.an un-, derbalanced shutterarra-ngedto be coiled on. and uncoiled ,trom said roller to open and close a wall opening, means for holding the shutter in various openpositions arranged. to release the shutter upon,;the-oc5 currence ofa dangerous rise in temperature,-

and flexible means arranged to be operated manually to raise the shutters 2. An automatic fire shutter mechanism comprising in. combination a movable shutter arranged adjacent a wall opening, means for holding the shutter in various, open p01 sitions arran ed, to release the shutter upon the occurrence of a dangerousJrise-in temperature, and flexible means, arranged to operate independently of the downward move ment of the shutter for raising the shutter manually from one side of said wall.

3; An automatic fire shutter mechanism comprising in combination a roller, a shutter arranged to be coiled up on and uncoiled from said roller, means, for; holdiiig-theshufi ter in open position, arranged to release the shutter upon the occurrenceot a dangerous rise in temperature, and means arranged to be manually operated normally to: impart an intermittent upward movement tothe shutter. v a

4. An automatic fire shuttermechanism comprising in combination a. roller, a shutter arranged to be coiled up on and uncoiled' from said roller to open and close the same, means for holding the shutter in openposition, arranged to release the shutter upon a dangerous rise in temperature, an intermittent grip device for imparting a step by step raising movement to the shutter, and flexible, means for manually actuating said grip device.

5. An automatic fire shutter mechanism comprising in combination a roller, a shutter arranged to be coiled up on and uncoiled from said roller to open and close the same, means for holding the shutter in'openpo sition, arranged to release the shutter upon the occurrence of a dangerous rise in. tem perature, and normally inactive mechanism for raising the shutter manually;

. 6. An. automatic fire shutter mechanism comprising" in combination a roller',..a' shutter arrangedto he coiled upv on and uncoiled from said roller, means for holding the shutter in various open positions -arranged to release the shutter upon the 00 ing, after each rising movement imparted thereto.

8. An automatic fire shutter mechanism.

comprising in combination a coiling shutter arranged to open and close a wall opening and means comp'risinga slippery brake for holding the shutter in open position.

9. An automatic fire shutter mechanism comprising in combination a coiling shutter arranged to open and close a wall opening,

and mechanism comprising a brake for holding the shutter in any position, said brake having grease-holding recesses for applying grease to the contacting surfaces of the brake.

10. An automatic fire shutter mechanism,

comprising in combination a coiling shutter arranged to open and close a wall opening, meansfor holding the shutter at any position, arranged to release the shutter upon the occurrence ofa dangerous rise in temperature, said means allowing the. shutter to be lifted freely and mechanism for raising the'shutter manually.

"11. An automatic fire shutter mechanism comprising in combination a coiling shutter arranged to open and close a wall opening, means for holding the shutter in open position, arranged to release the shutter upon the occurrence of a dangerous rise in tem perature, mechanism for retarding the downward'movement of the shutter, said holding means'and retarding mechanism being arranged to allow the shutter to be lifted freely and to hold the shutter from descending when partially or wholly raised, and mechanism for manually raising the shutter.

12. An automatic fire shutter mechanism comprising in combination a coiling shutter arranged to open and close a wall opening,

mechanism for holding the shutter in open position, flexible means arranged to control said -mechanism comprising afusible element, and normally slack means for connecting the points in said flexible means normally connected by said fusible element.

13. An automatic fire shutter mechanism comprising in combination a coiling shutter arranged to open and'closea wall opening, devices for holding the shutter in raised position, a train of connected elements for controlling said devices comprising a fusible link and normally slack means for connectopposite sides adjacent a wall opening, devices for holding the shutter in open position, a train of connected elements comprising a fusible member for controlling said devices, arranged to allow an elongation of saidtrain to release said devices upon the fusing of said member while the remaining elements continue in connected relation.

16. An automatic fire shutter mechanism, comprising in combination a coiling shutter arranged adjacent a. wall opening, devices for holding the shutter in open position and flexible means for controlling said devices, comprising a fusible member arranged to allow an elongation of said means-to release lsgaid devices upon the fusing of said memer.

17. An automatic fire shutter mechanism,

comprising in combination a coiling shutter arranged ad acent a wall openlng, devices for holding the shutter in open position,

that the fusible link may be replaced from the inner side of the wall.

19. An automatic fire shutter mechanism, comprising in combination a coiling shutter arranged to open and close a wall 'opening, constantly operative. counterbalancing means for the shutter, means for holding the shutter in open position, arranged to release the shutter upon the occurrence of a dangerous rise in temperature, and means arranged to operate independently of the downward movement of the shutter for raising the shutter manually.

20. An automatic fire shutter mechanism comprising in combination a movable shutindependently of the downward movement of the shutter for raising the shutter manually when it has closed following its release by said holding means.

21. An automatic fire shutter mechanism comprising in combination a movable shutter arranged adjacent a wall opening, means for holding the shutter in various open positions, arranged to release the shutter upon the occurrenoe of a dangerous rise in tem perature, and means arranged to operate independently of the downward movement of the shutter for raising the shutter whenever it is closed or partially open.

22. An automatic fire shutter'mechanism comprising in combination a movable shutter arranged adjacent a wall opening, means for holding the shutter in any position in which it is placed, arranged to release-the shutter upon the occurrence of a dangerous rise in temperature, and means normally operatively disconnected r'rom the shutter for raising the shutter manually.

23. An automatic fire shutter mechanism comprising in combination a movable shutter constructed and arranged for movement to open and close a wall opening, means for holding the shutter in an open position, arranged to allow the shutter to be raised and lowered manually while said means continues in operation, and manually operable means for raising the shutter.

24:. An automatic fire shutter mechanism comprising in combination a movable shut-' ter arranged adjacent a wall opening, manually operable means for raising the shutter,

and means for holding the shutter in any position in which it is placed, arranged to allow the shutter to be raised and lowered manually against the action of said holding means.

25'. An automatic fire shutter mechanism comprising in combination a movable shutter, constructed and arranged for movement to open and close a wall opening, means for holding the shutter in any position in which it is placed, arranged to allow the shutter to be raised and lowered manually against the action of said holding means, and manually operable means for normally imparting,

when operated, a step-bystep lifting movement to the shutter.

26; An automatic fire shutter mechanism comprising in combination a coiling shutter arranged to open and close a wall opening,

a roller upon which said shutter is coiled,

means for rotating the roller to raise the shutter, comprising an oscillatory arm and a connection between said arm and roller for intermittently rotating the roller.

2'7. An automatic fire shutter mechanism comprising in combination a coiling shutter arranged to open and close a wall opening, a roller upon which said shutter is'cOiled, means tor rotating the roller to raise the shutter, comprising an oscillatory arm, mounted-coaxially withthe roller, a gripping device carried by said arm for intermittently rotating the roller by said arm,

and a flexible element connected with said arm for oscillating the arm manually. 7

28. A fire shutter mechanism comprising in. combination, a coiling shutter arranged adjacent awall opening, constantly operating counterbalancing means for the shutter, and an independent lifting device inactive during certain movements of the shutter for raising the shutter manually.

29. A fire shutter mechanism comprising in combination a coiling shutter arranged adjacent a wall opening, counterbalancing means operating on the shutter during any movement of the shutter, and an independent lifting device inactive during certain movements of the shutter for raising'the shutter manually.

30. A fire shutter mechanism comprising incombination, a movable shutter arranged adjacent a wall opening, means for counterbalancing the shutter for up and down movement, and means normally operatively disconnected trom the shutter for raising-the shutter manually.

Signed at New York this 14th December 1925.

WALTER n. DUNoANsoN.

day of 

